KORALvit 8oz. Combi contains important elements that are necessary for thriving corals, giant clams and coralline algae in reef tanks. These substances get lost in several ways, e.g. due to natural uptake of the organisms, foam fractionating, or the use of activated carbon. Additionally the KORALvit Combi solution contains an additive that enhances the performance of the foam fractionator, so the export of waste products will be increased. To prevent a strong growth of undesired algae, KORALvit Combi has a low contents of iron. In a reef tank populated by invertebrates of various genera, KORALvit Combi can be used without any additives and ensures a sufficient supply with elements.